Product Overview
This document provides comprehensive instructions for the 1PC 404865 3.7V 1800mAh Polymer Lipo Battery with PCM Rechargeable Battery. It covers product specifications, usage guidelines, maintenance, and safety information to ensure optimal performance and longevity of your battery.

Figure 1: The 404865 3.7V 1800mAh Polymer Lipo Battery, showing its flat rectangular shape and attached red (positive) and black (negative) lead wires.
Key Features
- High Capacity: 1800mAh for extended usage.
- Nominal Voltage: 3.7V, with a full charge voltage of 4.2V.
- Integrated PCM: Includes a Protection Circuit Module for overcharge, over-discharge, and short-circuit protection.
- Compact Size: Dimensions of approximately 40mm x 48mm x 65mm (Thickness x Width x Length).
- High Discharge Platform: Ensures stable voltage output during use.
- Long Cycle Life: Designed for durability and repeated charging cycles.

Figure 2: An illustrative diagram highlighting the core characteristics of the battery, emphasizing its quality, safety, and performance attributes.
Specifications
| Parameter | Value |
|---|---|
| Product Name | 3.7V Lithium Polymer Battery |
| Model Number | 123048 |
| Capacity | 1800mAh |
| Nominal Voltage | 3.7V |
| Full Charge Voltage | 4.2V |
| Dimensions (TxWxL) | 40mm x 48mm x 65mm (± tolerances) |
| Lead Wire Length | Approx. 2-5CM (0.1 square red and black line) |
| Charging Cut-off Voltage | 4.25V |
| Discharge Cut-off Voltage | 2.75V |
| Max Discharge Current | 0.5A |
| Overcharge Protection Voltage | 4.20V ± 0.05V |
| Over-discharge Protection Voltage | 2.7V ± 0.1V |
| Over-current Protection | 3.0 ± 1.0A (2.7V ~ 4.25V) |
| Discharge Temperature | -20°C ~ +60°C |
| Battery Cell Type | Lithium Ion Polymer |
Setup and Connection
The 404865 Polymer Lipo Battery comes with pre-attached red and black lead wires for easy integration into your device. Ensure correct polarity when connecting the battery to avoid damage to the battery or the device.
- Identify Polarity: The red wire is positive (+), and the black wire is negative (-).
- Connect to Device: Carefully connect the battery leads to the corresponding positive and negative terminals of your electronic device.
- Secure Connection: Ensure connections are secure to prevent accidental disconnection or short circuits.

Figure 3: A detailed view of the battery's integrated Protection Circuit Module (PCM), which manages charging, discharging, and provides safety features.
Operating Instructions
This battery is designed for use in various portable electronic devices. Proper charging and discharging practices are crucial for battery health and safety.
Charging the Battery
- Use a compatible lithium polymer battery charger.
- Ensure the charger's voltage and current settings match the battery's specifications (3.7V nominal, 4.2V full charge).
- The integrated PCM will manage overcharge protection, cutting off charging at 4.25V.
- Avoid overcharging beyond the specified voltage.
Discharging the Battery
- The battery is designed to discharge safely within its operational voltage range.
- The PCM provides over-discharge protection, cutting off discharge at 2.75V to prevent damage.
- Avoid deep discharge below the cut-off voltage, as this can reduce battery lifespan.
- Do not exceed the maximum discharge current of 0.5A.
Maintenance and Storage
Proper maintenance and storage are essential for maximizing the lifespan and performance of your battery.
- Temperature: Store the battery in a cool, dry place, ideally between 0°C and 25°C. Avoid extreme temperatures.
- Charge Level for Storage: For long-term storage, charge the battery to approximately 50% of its capacity (around 3.8V-3.9V). Do not store fully charged or fully discharged.
- Regular Check: If stored for extended periods, check the battery voltage every few months and recharge to 50% if necessary.
- Physical Care: Avoid puncturing, crushing, or exposing the battery to water or fire.
- Disposal: Dispose of depleted or damaged batteries according to local regulations for lithium-ion batteries. Do not dispose of in general waste.
Troubleshooting
If you encounter issues with your battery, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Battery not charging | Incorrect charger, faulty connection, or PCM protection activated. | Ensure charger compatibility and proper connection. Check if the battery is deeply discharged (below 2.75V), which might require a specialized charger to reactivate the PCM. |
| Battery not powering device | Battery fully discharged, incorrect polarity, or device issue. | Charge the battery. Verify correct positive/negative connections. Test the device with another known good power source if possible. |
| Short battery life | Frequent deep discharges, high current draw, or aging battery. | Avoid discharging below the PCM cut-off. Ensure device current draw is within battery limits. Battery lifespan naturally decreases over time. |
| Battery swelling or overheating | Overcharging, internal damage, or manufacturing defect. | Immediately discontinue use. Safely remove the battery if possible and dispose of it properly. Do not attempt to charge or use a swollen battery. |
Applications
The 404865 3.7V 1800mAh Polymer Lipo Battery is versatile and suitable for a wide range of portable electronic devices due to its compact size and reliable power output.
Common applications include, but are not limited to:
- LED lights
- MP3 / MP4 players
- Small mobile phone toys
- Cameras and video cameras
- Other digital products requiring a compact 3.7V power source.
- Vital signs monitors
- Optical equipment (binoculars, night vision)
- Smoke detectors
- Gas meters
- Lighting fixtures
- Water meters
- Mini photo printers
- Patrol sensor devices

Figure 4: An illustration depicting the diverse range of applications for this battery, from personal electronics to specialized monitoring equipment.
Warranty and Support
For any special size and current requirements, or if you have questions regarding the product, please contact the seller directly. Information regarding specific warranty periods may be provided at the point of purchase.
Manufacturer: Easybuyseller

